With Josh Elliott out, Amy Robach was quickly promoted, but she doesn’t get along with co-host Lara Spencer, because she thinks the bubbly blond is all fluff and no substance, RadarOnline.com is exclusively reporting.

Reports emerged on Tuesday that Robach and Spencer don’t get alon, and our sources tell us, “That is a major understatement.

“Amy doesn’t get along with Lara at all, and can barely stand to be on the set with her. According to Amy, Lara is a total airhead, and doesn’t have a strong journalism background that merits her being a part of Good Morning America. Amy is no-nonsense, very serious journalist. Lara is the opposite; Amy wishes Lara would go back to reporting for Entertainment Tonight.”

Recently diagnosed with breast cancer, Robach underwent a grueling double mastectomy, and is undergoing chemotherapy, while continuing to work.

During this time, our source said, “Lara never came to visit Amy in the hospital, or even called her to see how she was doing; Robin Roberts, a breast cancer survivor, helped Amy navigate the complicated maze of what doctors to see, and has been a true friend to her during this time.”

“Josh is high-maintenance, and if viewers could see what he was like off the air, people would be truly shocked,” an insider claimed, adding that the former ESPN reporter is extremely insecure and needs constant validation from his colleagues.

Holding the dysfunctional ABC morning news team together is Roberts, according to our source.

“She is the main reason why GMA is number one, period,” the source said. “There was no way ABC was going to let Robin leave when her contract recently came up for renewal. If Josh thinks GMA got to number one because of him, he is totally misguided. The show will continue to dominate in the morning news ratings race, losing him won’t change that.”